Which object has the least amount of kinetic energy? a car driving down a road a soccer ball rolling down a hill a bicycle locke
2 answers:
Answer:
A bicycle locked to a bike
Explanation:
The kinetic energy of an object when an object is moving. The mathematical expression for the kinetic energy of an object is given by :
Where
m is the mass of an object
v is the velocity of an object
First option : A car driving down a road, the car is moving i.e. it will possess kinetic energy.
Second option : A soccer ball rolling down a hill, the ball is moving i.e. it will possess kinetic energy
Third option : A bicycle locked to a bike, neither bicycle nor bike is moving i.e. it will not possess kinetic energy.
Fourth option : A satellite orbiting Earth, the satellite is moving i.e. it will possess kinetic energy.
Hence, "a bicycle locked to a bike " has least amount of kinetic energy.
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Answer:
The answer is 0.83 seconds.
Explanation:
The formula of free fall is following:
Where g=9.8 m/s^2 and t=2 seconds, the rock takes:
19.6 meters. This is the half distance of the cliff. The whole distance is 39.2 meters. So it takes:
2.83 second to fall down completely. The rock takes the second half of the cliff in 0.83 seconds